speed up DockerSuite.TestRunContainerWithReadonlyRootfs
speed up DockerSuite.TestRunContainerWithReadonlyRootfs

Signed-off-by: Shijiang Wei <d51735f6fb3b158a0436903895ceec01381bfb9f@gmail.com>

mtrmac/docker,trebonian/docker,kojiromike/docker,joaofnfernandes/docker.github.io,Mokolea/docker,pradipd/moby,stainboy/docker,mohmost12/docker,ffoysal/docker,kencochrane/docker,nawawi/docker,fcrisciani/docker,tkopczynski/docker,cloudflare/docker,crosbymichael/docker,johnstep/docker.github.io,michelvocks/docker,x1022as/docker,cr7pt0gr4ph7/docker,q384566678/docker,allencloud/docker,cpuguy83/docker,gjaskiewicz/moby,gigidwan/docker,docker/docker,xiekeyang/docker,menglingwei/denverdino.github.io,stevvooe/docker,splunk/docker,justyntemme/docker,coolljt0725/docker,moxiegirl/docker,rillig/docker.github.io,dmcgowan/docker,docker/docker.github.io,jvanz/docker,BenHall/docker,AkihiroSuda/docker,cloudflare/docker,q384566678/docker,amatsus/docker,flavio/docker,unclejack/docker,TheBigBear/docker,unclejack/docker,anweiss/docker.github.io,sarnautov/moby,yosifkit/docker,toli/docker,ndeloof/docker,konstruktoid/docker-1,menglingwei/denverdino.github.io,mixja/docker,hypriot/docker,YuPengZTE/docker,phiroict/docker,rkazak/docker,djs55/docker,tmp6154/docker,dongjoon-hyun/docker,danix800/docker.github.io,estesp/docker,tklauser/docker,ajaymdesai/docker,akira-baruah/docker,noxiouz/docker,msabansal/docker,mike1729/docker,jwhonce/docker,noironetworks/docker,mikedougherty/docker,rhatdan/storage,diogomonica/docker,trebonian/docker,sunyuan3/docker,AkihiroSuda/docker,gigidwan/docker,afein/docker,cpuguy83/docker,troy0820/docker.github.io,Morsicus/docker,madhanrm/docker,anweiss/docker.github.io,thaJeztah/docker.github.io,jthelin/docker,dsau/docker,moby/moby,londoncalling/docker.github.io,tophj-ibm/moby,ripcurld0/moby,tonistiigi/docker,jimjag/docker,justincormack/docker,JimGalasyn/docker.github.io,mahak/docker,srust/docker,xiekeyang/docker,DoraALin/docker,sanscontext/docker.github.io,gnailuy/docker,pyotr777/docker,kolyshkin/docker,Mokolea/docker,jzwlqx/denverdino.github.io,darrenstahlmsft/docker,kolyshkin/docker,errordeveloper/docker,nalind/docker,justyntemme/docker,konstruktoid/docker-upstream,denverdino/docker.github.io,jimjag/docker,sdurrheimer/docker,ivansaracino/docker,harche/docker,denverdino/denverdino.github.io,menglingwei/denverdino.github.io,cr7pt0gr4ph7/docker,bearstech/moby,hqhq/moby,qudongfang/docker,TheBigBear/docker,darrenstahlmsft/moby,naveed-jamil-tenpearls/moby,inatatsu/docker,DoraALin/docker,moul/docker,michael-holzheu/docker,tophj-ibm/docker,umerazad/docker,konstruktoid/docker-1,Mashimiao/docker,shin-/docker.github.io,justincormack/docker,bearstech/moby,Altiscale/docker,darrenstahlmsft/docker,TrumanLing/docker,xiaods/docker,wenchma/docker,charleswhchan/docker,sheimi/docker,catinthesky/docker,djs55/docker,mahak/docker,errordeveloper/docker,scotttlin/docker,Mokolea/docker,anortef/docker,pradipd/moby,sanjeo/docker,KingEmet/docker,containers/storage,medallia/docker,anweiss/docker.github.io,KarthikNayak/docker,aduermael/docker.github.io,splunk/docker,jimjag/docker,Tenk42/docker,catinthesky/docker,thtanaka/docker,ffoysal/docker,OnePaaS/docker,msabansal/docker,nawawi/docker,menglingwei/denverdino.github.io,Shopify/docker,gjaskiewicz/moby,rhatdan/docker,yasiramin10p/moby,bluebreezecf/docker,sfsmithcha/docker,kolyshkin/moby,mikebrow/docker,joaofnfernandes/docker.github.io,mtesselH/docker,nalind/docker,trebonian/docker,shishir-a412ed/docker,mathewkoshy493/docker,prertik/docker,konstruktoid/docker-upstream,dmcgowan/docker,danyalKhaliq10p/moby,mikebrow/docker,jzwlqx/denverdino.github.io,jwhonce/docker,ajaymdesai/docker,bluebreezecf/docker,jzwlqx/denverdino.github.io,toli/docker,TrumanLing/docker,mkumatag/docker,YuPengZTE/docker,achanda/docker,justyntemme/docker,alexisbellido/docker.github.io,shubheksha/docker.github.io,anortef/docker,denverdino/denverdino.github.io,jecarey/docker,tophj-ibm/moby,thaJeztah/docker.github.io,pramodhkp/moby,Mashimiao/docker,bearstech/moby,xiekeyang/docker,rremer/moby,rillig/docker.github.io,sdurrheimer/docker,shin-/docker.github.io,inatatsu/docker,afein/docker,BSWANG/denverdino.github.io,cyli/docker,yosifkit/docker,moxiegirl/docker,Microsoft/docker,yasiramin10p/moby,crosbymichael/docker,sanscontext/docker.github.io,mgoelzer/docker,twaugh/docker,troy0820/docker.github.io,jimjag/docker,fcrisciani/docker,mtesselH/docker,flavio/docker,tonistiigi/docker,icaoweiwei/docker,TrumanLing/docker,rillig/docker.github.io,jhorwit2/docker,zhuguihua/docker,14rcole/docker,rremer/moby,jlebon/docker,LaynePeng/docker,BSWANG/denverdino.github.io,jlebon/docker,cpuguy83/docker,nawawi/docker,alfred-landrum/docker,SvenDowideit/docker,tianon/docker,docker-zh/docker.github.io,kunalkushwaha/docker,abhinavdahiya/docker,sdurrheimer/docker,darrenstahlmsft/moby,pyotr777/docker,eskaaren/docker,medallia/docker,docker/docker.github.io,dgageot/docker,phiroict/docker,jameszhan/docker,duglin/docker,dnephin/docker,docker-zh/docker.github.io,moul/docker,moul/docker,ivansaracino/docker,ibuildthecloud/docker,HuKeping/docker,bonczj/moby-json-file-logger,joaofnfernandes/docker.github.io,KarthikNayak/docker,xuxinkun/docker,ColinHebert/docker,kencochrane/docker,rkazak/docker,moxiegirl/docker,resin-io/docker,johnstep/moby-moby,geekylucas/docker,thtanaka/docker,phiroict/docker,thaJeztah/docker.github.io,thaJeztah/docker,tkopczynski/docker,unclejack/docker,bdwill/docker.github.io,xiaods/docker,pramodhkp/moby,mikebrow/docker,erikstmartin/docker,thtanaka/docker,naveed-jamil-tenpearls/moby,dsheets/moby,zhuguihua/docker,anweiss/docker.github.io,dccurtis/docker,yongtang/docker,vdemeester/docker,medallia/docker,jongiddy/docker,shin-/docker.github.io,cyphar/docker,duglin/docker,konstruktoid/docker-1,Ramzec/docker,JMesser81/docker,anortef/docker,yosifkit/docker,ibuildthecloud/docker,shin-/docker.github.io,dsheets/moby,tklauser/docker,willmtemple/docker,jlebon/docker,jongiddy/docker,BSWANG/denverdino.github.io,rillig/docker.github.io,Syntaxide/docker,charleszheng44/moby,Morsicus/docker,endophage/docker,brahmaroutu/docker,kerneltime/docker,sarnautov/moby,rremer/moby,KingEmet/docker,sanscontext/docker.github.io,michelvocks/docker,ivansaracino/docker,raja-sami-10p/moby,trebonian/docker,thaJeztah/docker,stainboy/docker,abhinavdahiya/docker,denverdino/denverdino.github.io,mohmost12/docker,dperny/docker,Shopify/docker,shhsu/docker,djs55/docker,gdevillele/docker.github.io,bluebreezecf/docker,pecameron/docker,gschaetz/moby,sterchelen/docker,alexisbellido/docker.github.io,mikedougherty/docker,miminar/docker,willmtemple/docker,x1022as/docker,bfirsh/docker,gnailuy/docker,BenHall/docker,gigidwan/docker,liaoqingwei/docker,bdwill/docker.github.io,Syntaxide/docker,lixiaobing10051267/docker,laijs/docker,PatrickLang/moby,LuisBosquez/docker.github.io,dims/docker,moypray/docker,jlhawn/docker,jecarey/docker,mathewkoshy493/docker,sanscontext/docker.github.io,paralin/docker,denverdino/denverdino.github.io,qudongfang/docker,KingEmet/docker,gdevillele/docker.github.io,aduermael/docker.github.io,nguyentm83/docker,ColinHebert/docker,alfred-landrum/docker,laijs/moby,LuisBosquez/docker.github.io,hqhq/moby,harche/docker,YujiOshima/docker,londoncalling/docker.github.io,erikh/docker,nghiant2710/docker,mixja/docker,maxamillion/docker,akira-baruah/docker,erikstmartin/docker,joeuo/docker.github.io,yp-engineering/docker,rhatdan/docker,asbjornenge/docker,xuxinkun/docker,alexisbellido/docker.github.io,phiroict/docker,jvanz/docker,moypray/docker,coreos/docker,docker-zh/docker.github.io,catinthesky/docker,LuisBosquez/docker.github.io,moul/docker,estesp/docker,troy0820/docker.github.io,lixiaobing1/docker,kunalkushwaha/docker,aduermael/docker.github.io,jlhawn/docker,Tenk42/docker,mikedougherty/docker,mstanleyjones/docker,HuKeping/docker,jhorwit2/docker,crosbymichael/docker,endophage/docker,sarnautov/moby,bdwill/docker.github.io,haveatry/docker,sean-jc/docker,sheimi/docker,inatatsu/docker,sfsmithcha/docker,tagomoris/docker,shubheksha/docker.github.io,YujiOshima/docker,fcrisciani/docker,tmp6154/docker,nghiant2710/docker,shin-/docker.github.io,hqhq/moby,mathewkoshy493/docker,harche/docker,mtanlee/docker,erikh/docker,stevvooe/docker,allencloud/docker,13W/docker,tmp6154/docker,johnstep/docker.github.io,ndeloof/docker,brahmaroutu/docker,bdwill/docker.github.io,splunk/docker,Morsicus/docker,imkin/moby,tianon/docker,mgoelzer/docker,danix800/docker.github.io,yp-engineering/docker,rkazak/docker,Mokolea/docker,ibuildthecloud/docker,docker/docker.github.io,BSWANG/denverdino.github.io,moby/moby,eskaaren/docker,ripcurld0/moby,BenHall/docker,coreos/docker,vdemeester/docker,konstruktoid/docker-upstream,nalind/docker,erikstmartin/docker,tkopczynski/docker,13W/docker,ZJU-SEL/docker,estesp/docker,lixiaobing1/docker,shhsu/docker,shubheksha/docker.github.io,LuisBosquez/docker.github.io,projectatomic/docker,kunalkushwaha/docker,twaugh/docker,phiroict/docker,Syntaxide/docker,denverdino/denverdino.github.io,portworx/docker,dongjoon-hyun/docker,scotttlin/docker,stevvooe/docker,srust/docker,liaoqingwei/docker,lixiaobing1/docker,londoncalling/docker.github.io,gdevillele/docker.github.io,dims/docker,yongtang/docker,ailispaw/docker,docker/docker,containers/storage,moby/moby,kencochrane/docker,jhorwit2/docker,icaoweiwei/docker,HideoYamauchi/docker,denverdino/docker.github.io,anujbahuguna/docker,Ramzec/docker,kerneltime/docker,jwhonce/docker,raja-sami-10p/moby,JimGalasyn/docker.github.io,moypray/docker,cyphar/docker,JMesser81/docker,wenchma/docker,pyotr777/docker,umerazad/docker,mtanlee/docker,scollier/docker,ibuildthecloud/docker,yummypeng/docker,konstruktoid/docker-upstream,portworx/docker,HideoYamauchi/docker,PatrickLang/moby,whuwxl/docker,13W/docker,abhinavdahiya/docker,mahak/docker,madhanrm/docker,jongiddy/docker,YuPengZTE/docker,mgoelzer/docker,scotttlin/docker,cloudflare/docker,AkihiroSuda/docker,tagomoris/docker,resin-io/docker,vdemeester/docker,sanjeo/docker,Altiscale/docker,errordeveloper/docker,Altiscale/docker,LaynePeng/docker,coolljt0725/docker,joeuo/docker.github.io,13W/docker,achanda/docker,dnephin/docker,pecameron/docker,mkumatag/docker,KarthikNayak/docker,cyli/docker,hypriot/docker,maxamillion/docker,cyphar/docker,q384566678/docker,michael-holzheu/docker,danyalKhaliq10p/moby,qudongfang/docker,prertik/docker,willmtemple/docker,joeuo/docker.github.io,portworx/docker,dperny/docker,rhatdan/storage,x1022as/docker,rhardih/docker,mike1729/docker,raja-sami-10p/moby,Tenk42/docker,afein/docker,cr7pt0gr4ph7/docker,wenchma/docker,danix800/docker.github.io,thaJeztah/docker,mkumatag/docker,justincormack/docker,SvenDowideit/docker,bonczj/moby-json-file-logger,haveatry/docker,johnstep/docker.github.io,laijs/docker,yummypeng/docker,noxiouz/docker,xiaods/docker,mtesselH/docker,alexisbellido/docker.github.io,michelvocks/docker,docker/docker,madhanrm/docker,docker-zh/docker.github.io,nalind/docker,darrenstahlmsft/docker,diogomonica/docker,DoraALin/docker,erikh/docker,ripcurld0/moby,liaoqingwei/docker,isubuz/docker,runcom/docker,miminar/docker,mtrmac/docker,srust/docker,ailispaw/docker,kerneltime/docker,gschaetz/moby,mohmost12/docker,mtanlee/docker,docker/docker.github.io,projectatomic/docker,mstanleyjones/docker,medallia/docker,hypriot/docker,denverdino/docker.github.io,flavio/docker,runcom/docker,dsau/docker,miminar/docker,Mashimiao/docker,londoncalling/docker.github.io,tophj-ibm/docker,rancher/docker,rhatdan/docker,gdevillele/docker.github.io,gnailuy/docker,mike1729/docker,johnstep/docker.github.io,joeuo/docker.github.io,sheimi/docker,menglingwei/denverdino.github.io,pradipd/moby,dccurtis/docker,resin-io/docker,OnePaaS/docker,denverdino/docker.github.io,dnephin/docker,asbjornenge/docker,ZJU-SEL/docker,yummypeng/docker,michael-holzheu/docker,ColinHebert/docker,allencloud/docker,mstanleyjones/docker,shubheksha/docker.github.io,bfirsh/docker,londoncalling/docker.github.io,LaynePeng/docker,POLJM242/docker,bearstech/moby,darrenstahlmsft/moby,ndeloof/docker,achanda/docker,yp-engineering/docker,eskaaren/docker,nguyentm83/docker,sterchelen/docker,thaJeztah/docker.github.io,nawawi/docker,runcom/docker,zhuguihua/docker,Shopify/docker,jthelin/docker,dmcgowan/docker,troy0820/docker.github.io,jvanz/docker,charleszheng44/moby,cyli/docker,lixiaobing10051267/docker,ibuildthecloud/docker,haveatry/docker,laijs/docker,sunyuan3/docker,dccurtis/docker,JMesser81/docker,anujbahuguna/docker,thaJeztah/docker,laijs/moby,YujiOshima/docker,SvenDowideit/docker,mixja/docker,johnstep/docker.github.io,kojiromike/docker,dongjoon-hyun/docker,johnstep/moby-moby,Microsoft/docker,noironetworks/docker,LuisBosquez/docker.github.io,noironetworks/docker,aduermael/docker.github.io,isubuz/docker,gnailuy/docker,nghiant2710/docker,yongtang/docker,geekylucas/docker,tagomoris/docker,AkihiroSuda/docker,dgageot/docker,rhardih/docker,charleswhchan/docker,rancher/docker,JimGalasyn/docker.github.io,ailispaw/docker,naveed-jamil-tenpearls/moby,paralin/docker,coolljt0725/docker,geekylucas/docker,sterchelen/docker,mahak/docker,flavio/docker,paralin/docker,sanjeo/docker,yasiramin10p/moby,jzwlqx/denverdino.github.io,HuKeping/docker,thaJeztah/docker.github.io,gjaskiewicz/moby,isubuz/docker,alfred-landrum/docker,umerazad/docker,bonczj/moby-json-file-logger,sean-jc/docker,Ramzec/docker,stainboy/docker,JimGalasyn/docker.github.io,bfirsh/docker,imkin/moby,johnstep/moby-moby,endophage/docker,sunyuan3/docker,rancher/docker,laijs/moby,tophj-ibm/docker,joaofnfernandes/docker.github.io,twaugh/docker,gdevillele/docker.github.io,jlhawn/docker,dsau/docker,jameszhan/docker,13W/docker,tonistiigi/docker,danyalKhaliq10p/moby,danix800/docker.github.io,tophj-ibm/moby,pramodhkp/moby,rhatdan/storage,mtrmac/docker,xuxinkun/docker,denverdino/docker.github.io,charleszheng44/moby,coreos/docker,ffoysal/docker,PatrickLang/moby,bdwill/docker.github.io,paralin/docker,scollier/docker,whuwxl/docker,dims/docker,tklauser/docker,lixiaobing10051267/docker,asbjornenge/docker,kolyshkin/moby,dperny/docker,containers/storage,POLJM242/docker,shubheksha/docker.github.io,brahmaroutu/docker,Microsoft/docker,dgageot/docker,BSWANG/denverdino.github.io,amatsus/docker,anujbahuguna/docker,TheBigBear/docker,prertik/docker,14rcole/docker,shhsu/docker,dsheets/moby,toli/docker,shishir-a412ed/docker,kojiromike/docker,alexisbellido/docker.github.io,noxiouz/docker,sfsmithcha/docker,sean-jc/docker,shishir-a412ed/docker,cpuguy83/docker,docker-zh/docker.github.io,joeuo/docker.github.io,anweiss/docker.github.io,OnePaaS/docker,jzwlqx/denverdino.github.io,msabansal/docker,docker/docker.github.io,JimGalasyn/docker.github.io,jameszhan/docker,amatsus/docker,projectatomic/docker,sanscontext/docker.github.io,diogomonica/docker,pecameron/docker,joaofnfernandes/docker.github.io,maxamillion/docker,gschaetz/moby,charleswhchan/docker,moby/moby,duglin/docker,ajaymdesai/docker,icaoweiwei/docker,Ramzec/docker,kolyshkin/moby,whuwxl/docker,imkin/moby,yosifkit/docker,HideoYamauchi/docker